Re: CDC Layout

["Fernando J. Barbosa" <barbosa@jlab.org>]

Hi Curtis,

I don't know where those numbers come from as I find no accounting for 
those. Most likely, Elke added spares and perhaps accounted for future 
price increases to provide some cushioning.

The numbers I have on GlueX-doc-747 are 3,098 straws which correspond to 
130 preamp cards. The production cost of the ASIC is estimated to be 
$169,500 and the CDC uses about 20% of the ASICs - $33.9k. The price per 
preamp card is estimated to be $114 - $14.8k for 130. So, the total for 
the CDC production is ~$49k.

On Elke's schedule bar chart, line item 15212080 has $67,084 for the CDC 
preamp procurement but no quantity is shown and I don't know if this 
includes anything else. Given the number of preamp cards required, I 
would say we are safe but Elke may want to comment on this.

I plan to capture all the costs related to the electronics (ASICs, PCBs, 
cables, fADCs, etc) for both the CDC and the FDC in one single 
spreadsheet which is easier to update and keep track of. Cost estimates 
for increased channel numbers will then be easy to get. Please provide 
me with updates on the channel numbers once available from the current 
studies.

Thanks,
Fernando



Curtis A. Meyer wrote:
> Hi Elke -
>
>      for some reason, I thought that we had 3500 channels on the books,
> not 3300 (basically the difference is in layer 28.) . With regard to the space,
> I am also worried about this, but with regard to the realestate for the preamplifiers.
> The design that we laid out a year ago had about 3100 channels. Now there 
> is certainly some space left, but it really comes down to can we squeeze the 
> preamplifiers on the plenum. 
>
>     thanks for the comments  -- Curtis
>
>
> On Sun March 1 2009, Elke-Caroline Aschenauer wrote:
>   
>> On Fri, 27 Feb 2009, Fernando J. Barbosa wrote:
>>
>> Dear Fernando and Curtis,
>>
>> the 3500 straws will be an increase in cost. I have budget everythig for 
>> 3300, it will be 200 more. this means 25 asics, 8 more preamp-cards 
>> HV-cards and 3 FADCc. I think it is not a big deal, but needs to be 
>> accounted for. I'm not sure, but maybe at a certain moment we might want 
>> to put in a CR to have things accounted correctly.
>>
>> But I have a different question, I totally understand more layers are 
>> nices for tracking, but do we get more problems with the cabeling. Because 
>> we wil have to make even more connections on a limited space.
>>
>>     
>
>
>
>   
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